/**
*      author: Y_Yao
*      created: 2025-03-15 12:56:48
**/

#include<bits/stdc++.h>

#define int LL
using namespace std;
using LL = long long;
const LL LLINF = 9e18;
const int INF = 0x3f3f3f3f;

void solve()
{
    string s;
    cin >> s;
    int sum = 0;
    for(int i = 0;i < s.size();i++)
    {
        sum += stoll(s.substr(i,1));
    }
    if(sum % 9 != 0)
    {
        cout << "No" << endl;
    }
    else
    {
        cout << "Yes" << endl;
    }
}

signed main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);

    int t = 1;
    //cin >> t;
    while(t--)
    {
        solve();
    }
    return 0;
}